Radial drill.



H. DRESES & E- J. SPAETH.

RADIAL DRILL.

PPPPPPPPPPPPPPPPPPPPPPPPPP 1. 1,095,828.. Patented May 5, 1914.

UNITED STATES ATEN HENRY DRESES AND EDWARD J. SPAE'II-I, OF CINCINNATI, OI-IIO, ASSIGNOES TO DRESES MACHINE TOOL CO., A FIRM CONSISTINGr OF HENRY DRESES AND WILLIAM GILBERT, BOTH 0F CINCINNATI, OHIO. I

RADIAL DRILL.

Specification of Letters Patent.

Patented May 5,191.

Application filed November 24, 1911. Serial No. eearra To all whom it may concern:

Be it known that we, HENRY Dresses and EDWARD J. SPAETH, citizens of the United States, and both residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Radial Drills; and we do declare that the following is a clear, full, and exact description of the invention, attention being called to the drawing which accompanics this application and forms a part thereof.

This invention relates to machine tools like drills and concerns certain improvements in the construction of such tools and more particularly of those parts thereof whereby the head which carries the drill spindle is supported on the arm.

The invention consists of the construction of these parts as hereinafter described and claimed and as illustrated in the accompanyin drawing, in which:

Iigure 1 shows an end View partly in section of the arm of a drill which embodies the features of our invention. Fig. 2 in a similar view shows a modified construction.

In the drawing letter B indicates the usual arm which extends from the column (not shown).

E indicates the head which supports the drill spindle F, an upper bearing G and a lower bearing H being provided for the purpose. The arm is provided with ways 6-4), to which the head is fitted for adjustment. Motion for actuating the spindle is obtained from a shaft 17 supported above and rearwardly of arm B and transmitted by it to the spindle by gear-trains (not shown), there being usually a number of them to permit speed changes. Shaft 17 is actuated by means of a driving shaft 16 and by interposed gearing contained in a casing 19, the gear-elements mounted on shaft 16 being splined to said shaft.

Shaft 17 as well as the gearing above referred to and used in connection therewith, are supported on a bracket-structure K connected to the rear side of head E so as to move with it when the same is adjusted on arm B. Casing 19 also forms a part of this bracket-structure, bearings 20 being provided where shaft 16 passes through the same.

Shaft 16 is subject to objectionable strains transmitted to it by bearings 20 which form a connected part of bracket K. strains are due to the top-heaviness of head E produced by the weight of bracket K which hangs on its rear side. This topheaviness produces in head E a tendency to sag rearwardly causing thereby bearings 20 to lean heavily upon shaft 16. The reaction of the spindle also adds strain due to its position with reference to arm B from which it is laterally spaced. These strains tend to bend shaft 16, straining it thereby and causing it to bind in its bearings, subjecting both to heavy wear and lessening also the operative effectiveness of the tool by increasing the loss due to friction. This strain is offset by an additional third way which serves to support the weight of bracket K and parts carried thereby. It is provided on arm B and rearwardly of ways bb, on the front side of said arm. By preference this third way is provided on the rear side of the arm and in form of a ledge W. It may however be also located as shown at W in Fig. 2, where the upper edge of rib 21 provided on arm B, is used for the purpose,- said upper edge being straight. In either case immediate contact with this third Way is had by means of a bearing piece or shoe S connected to the movable structure K. This third way is of sufficient extent, longitudinally, so as to be always below this shoe in all positions to which head E may be ad justed on arm B.

Having described our invention, we claim as new:

1. In a drill, the combination of a drillspindle, a head on the front side of which said spindle is carried, an arm provided with ways on its front side to which the head, at its rear side, is movably fitted, and a third way laterally spaced from the ways first mentioned and parallel thereto and forming an additional support for the head.

2. In a drill, the combination of an arm provided with ways on its front side and on its rear side all parallel to each other, a

These head fitted to these ways and longitudinally 7 adjustable thereon and a drill-spindle carat its rear side to these ways, a bracketstructnre carried by the head and extending over the arm and to the other side thereof, spindle-operating means carried by said head and said bracket-structure, a driving shaft supported. on the arm below the bracket-structure and in operative connection with the spindle-operating means, bearings provided for this shaft on the bracket structure and a ledge projecting rearwardly from the arm and forming a rear support for the bracket-structure to prevent strain on the driving shait 1n the various positions to whlch the head 1s achusted on the arm.

In testimony whereof, we hereunto affix 15.

our signatures in the presence of two wit C. SPENGEL, T. Ln BEAU.

fiopies of this patent may be obtained for five cents each, by addressing the Commissioner 01- Eaton, Washington, D. G. 

